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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* GMime
* Copyright (C) 2000-2017 Jeffrey Stedfast
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gmime-filter-windows.h"
#include "gmime-charset.h"
#define d(x)
/**
* SECTION: gmime-filter-windows
* @title: GMimeFilterWindows
* @short_description: Determine if text is in a Microsoft Windows codepage
* @see_also: #GMimeFilter
*
* A #GMimeFilter used for determining if text marked as iso-8859-##
* is actually encoded in one of the Windows-CP125# charsets.
**/
static void g_mime_filter_windows_class_init (GMimeFilterWindowsClass *klass);
static void g_mime_filter_windows_init (GMimeFilterWindows *filter, GMimeFilterWindowsClass *klass);
static void g_mime_filter_windows_finalize (GObject *object);
static GMimeFilter *filter_copy (GMimeFilter *filter);
static void filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace);
static void filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace);
static void filter_reset (GMimeFilter *filter);
static GMimeFilterClass *parent_class = NULL;
GType
g_mime_filter_windows_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (GMimeFilterWindowsClass),
NULL, /* base_class_init */
NULL, /* base_class_finalize */
(GClassInitFunc) g_mime_filter_windows_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GMimeFilterWindows),
0, /* n_preallocs */
(GInstanceInitFunc) g_mime_filter_windows_init,
};
type = g_type_register_static (GMIME_TYPE_FILTER, "GMimeFilterWindows", &info, 0);
}
return type;
}
static void
g_mime_filter_windows_class_init (GMimeFilterWindowsClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GMimeFilterClass *filter_class = GMIME_FILTER_CLASS (klass);
parent_class = g_type_class_ref (GMIME_TYPE_FILTER);
object_class->finalize = g_mime_filter_windows_finalize;
filter_class->copy = filter_copy;
filter_class->filter = filter_filter;
filter_class->complete = filter_complete;
filter_class->reset = filter_reset;
}
static void
g_mime_filter_windows_init (GMimeFilterWindows *filter, GMimeFilterWindowsClass *klass)
{
filter->claimed_charset = NULL;
filter->is_windows = FALSE;
}
static void
g_mime_filter_windows_finalize (GObject *object)
{
GMimeFilterWindows *filter = (GMimeFilterWindows *) object;
g_free (filter->claimed_charset);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GMimeFilter *
filter_copy (GMimeFilter *filter)
{
GMimeFilterWindows *windows = (GMimeFilterWindows *) filter;
return g_mime_filter_windows_new (windows->claimed_charset);
}
static void
filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace)
{
GMimeFilterWindows *windows = (GMimeFilterWindows *) filter;
register unsigned char *inptr;
unsigned char *inend;
if (!windows->is_windows) {
inptr = (unsigned char *) in;
inend = inptr + len;
while (inptr < inend) {
register unsigned char c = *inptr++;
if (c >= 128 && c <= 159) {
d(g_warning ("Encountered text encoded in a Windows charset trying "
"to pass itself off as being encoded in %s",
windows->claimed_charset));
windows->is_windows = TRUE;
break;
}
}
}
*out = in;
*outlen = len;
*outprespace = prespace;
}
static void
filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
char **out, size_t *outlen, size_t *outprespace)
{
filter_filter (filter, in, len, prespace, out, outlen, outprespace);
}
static void
filter_reset (GMimeFilter *filter)
{
GMimeFilterWindows *windows = (GMimeFilterWindows *) filter;
windows->is_windows = FALSE;
}
/**
* g_mime_filter_windows_new:
* @claimed_charset: charset that a text stream claims to be
*
* Creates a new GMimeFilterWindows filter. When a stream of text has
* been filtered, it can be determined whether or not said text stream
* was in @claimed_charset or the equivalent Windows-CP125# charset.
*
* Returns: a new windows filter.
**/
GMimeFilter *
g_mime_filter_windows_new (const char *claimed_charset)
{
GMimeFilterWindows *new;
g_return_val_if_fail (claimed_charset != NULL, NULL);
new = g_object_new (GMIME_TYPE_FILTER_WINDOWS, NULL);
new->claimed_charset = g_strdup (claimed_charset);
return (GMimeFilter *) new;
}
/**
* g_mime_filter_windows_is_windows_charset:
* @filter: windows filter object
*
* Determines whether or not a Windows-CP125# charset has been
* detected so far.
*
* Returns: %TRUE if the filtered stream has been detected to contain
* Windows-CP125# characters or %FALSE otherwise.
**/
gboolean
g_mime_filter_windows_is_windows_charset (GMimeFilterWindows *filter)
{
g_return_val_if_fail (GMIME_IS_FILTER_WINDOWS (filter), FALSE);
return filter->is_windows;
}
/**
* g_mime_filter_windows_real_charset:
* @filter: windows filter object
*
* Figures out the real charset that the text is encoded in based on whether or not Windows-CP125# characters were found.
*
* Returns: a const string pointer to the claimed charset if filtered
* text stream was found not to contain any Windows-CP125# characters
* or the proper Windows-CP125# charset.
**/
const char *
g_mime_filter_windows_real_charset (GMimeFilterWindows *filter)
{
g_return_val_if_fail (GMIME_IS_FILTER_WINDOWS (filter), NULL);
if (filter->is_windows)
return g_mime_charset_iso_to_windows (filter->claimed_charset);
else
return filter->claimed_charset;
}
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